Piezoelastic properties of retgersite determined by ultrasonic measurementsD. Arbeck, E. Haussühl, L. Bayarjagal, B. Winkler, N. Paulsen, S. Haussühl and V. MilmanEur. Phys. J. B, 73 2 (2010) 167-175DOI: https://doi.org/10.1140/epjb/e2009-00423-9